Structural and Magnetic Properties of NiFe2-2xSnxCuxO4

0357675 - ÚACH 2011 RIV NL eng J - Článek v odborném periodiku
Isfahani, M.J.N. - Myndyk, M. - Arani, M.E. - Šubrt, Jan - Sepelak, V.
Structural and Magnetic Properties of NiFe2-2xSnxCuxO4.
Journal of Magnetism and Magnetic Materials. Roč. 322, č. 13 (2010), s. 1744-1747. ISSN 0304-8853. E-ISSN 1873-4766
Výzkumný záměr: CEZ:AV0Z40320502
Klíčová slova: ferrimagnetic * Mossbauer effect * magnetic property
Kód oboru RIV: CA - Anorganická chemie
Impakt faktor: 1.689, rok: 2010

The substituted nickel ferrite (NiFe2-2xSnxCuxO4, x=0, 0.1, 0.2, 0.3) was prepared by the conventional ceramic method. The effect of substitution of Fe3+ ions by Sn4+ and Cu2+ cations on the structural and magnetic properties of the ferrite was studied by means of Fe-57 Mossbauer spectroscopy, alternating gradient force magnetometry (AGFM) and Faraday balance. Whereas undoped NiFe2O4 adopts a fully inverse spinel structure of the type (Fe)[NiFe]O-4, Sn4+ and Cu2+ cations tend to occupy octahedral positions in the structure of the substituted ferrite. Based on the results of Mossbauer spectroscopic measurements, the crystal-chemical formula of the substituted ferrite may be written as (Fe)[NiFe1-2xSnxCux]O-4, where parentheses and square brackets enclose cations in tetrahedral (A) and octahedral [B] coordination, respectively. The Neel temperature and the saturation magnetization values of the NiFe2-2xSnxCuxO4 samples were found to decrease with increasing degree of substitution (x).
Trvalý link: http://hdl.handle.net/11104/0195884